Because last week Vic Lombardi reported that Moore feels fine and ready to go. He just needs the ok from Greek.

I think there's a small chance he could play, and I hope he does. I'd take a 75% Rahim over an of the Bolden, Bruton, and Huff trio we trot out in dime looks.

If they approach him as a smaller role, why risk another set back? And if he was to play a larger role, how much game shape and speed will he actually be in? Personally, id rather they gameplan knowing who's definitely going to be at safety. Seattle doesn't really have stretch the field WR threats as much. This game the front line will be more in play stopping Marshawn and Wilson running.

I think the Broncos are more interested in having Rahim back at 100% for the next 5+ years rather than having him back and rusty for the Super Bowl.
This is a clear case of the athlete wanting to play and the team wanting to protect their investment.